Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\mtamp3\vendor\norkunas\youtube-dl-php\tests\Entity\SubListItemTest.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\mtamp3\vendor\norkunas\youtube-dl-php\tests\Entity\SubListItemTest.php on line 10